There is so much debate about which end is which. . . The documentation is pretty clear now, the long end is a line coming off the road. The short end is the line that goes to your house. I installed this in a box outside my home where there was already a ground coupler. Swapped them for five minutes. My internet speed and TV reception have not changed. Does it really work to stop spikes? . . Who knows . . . But given the ease of installation and relatively low cost, I'll give it a 5 for now. I bought it because I got a knock on my cable
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